Fix command in documentation

Add missing argument to the command in the documentation

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index d2d9f777..a9734fe9 100644
--- a/README.md
+++ b/README.md
@@ -98,7 +98,7 @@ like:
 env GN_PROFILE=~/opt/gn-latest SERVER_PORT=5300 \
 	SQL_URI=<uri-to-override-the-default> \
 	./bin/genenetwork2 ./etc/default_settings.py \
-	-m unittest -v
+	-c -m unittest -v
 ```
 
 In the case where you use the default `etc/default_settings.py` configuration file, you can override any setting as demonstrated with the `SQL_URI` setting in the command above.